Combined cutting and creasing dies for paper slotting machines



Oct. 18, 1949. E. G. STAUDE 2,485,020

- COMBINED CUTTING AND CREASING DIE FOR PAPER SLOTTING MACHINES Filed Nov. 5, 1945 3 Sheets-Sheet l a v fivvE/vroz EDWIN 6.67:4 UDE A-r'rozNE Ys Oct. 18, 1949. STAUDE 2,485,020

COMBINED CUTTING AND CREASING DIE FOR Y PAPER SLOTTING MACHINES Filed Nov. 5, 1945 3 Sheets-Sheet 2 35 /NVENTOE 56.7 E WINGS-mues- ATTORNEYS Oct. 18, 1949. E. G. STAUDE 2,485,020

COMBINED CUTTING AND CREASING DIE FOR PAPER SLOTTING MACHINES Filed NOV. 5, 1945 3 Sheqts-Sheet 3 A TToRNE v5 Patented Oct. 18, 1949 common CUTTING AND carcasmo nms roa PAPER SLOTTING MACHINES Edwin G. Staude,.Minneapolis, Minni, alslg'nor to The Sperry Corporation, New York, N. Y., a

corporation of Delaware Application November 5, 1945, Serial N 0. 628,877

This invention relates to new and useful iniprovements 111 machines for slotting and creasing blanks to facilitate the subsequent folding of the blanks into box form, and more particularly to the construction of the slotting and creasing dies utilized in such maohines and is an improvement on my Patent-N0. 1,687,522.

In the manufacture of boxes or cartons made from corrugated paper, cardboard, or other such materials, it is usually customary to inwardly slot the blanks from opposite sides thereof and to transversely crease the blanks in alignment with the pairs of slots provided in the opposed edges of each blank, thereby to provide fold lines for facilitating folding the blank into box form,-

and also whereby the box blank may be folded upon itself to facilitate storage.

It is highly desirable in the manufacture of boxes of corrugated paper such as herein disclosed, that the slotting and creasing of the blanks be accurately formed and also that the creasing be such that when the various panels of the blank are, folded or bent along the crease marks to form the walls of the box, the walls will be disposed in right-angular relation with respect to one another and with respect to the bottom, when the box is erected ready for use.

Conventional container slotting machines are usually provided with two pairs of heads, one pair for cutting the slots in the blank and thesecond pair for forming the necessary creases, which, in the form of blank herein disclosed, are usually arranged in pairs and the creases of each pair are disposed in close proximity to one another and so related to each pair of slots that said slots are disposed between their respective creases and in parallel relation thereto.

To thus slot and crease the blanks in conventional machines, the blanks are first fed between the slotting heads which cut aligned slots in the leading and trailing edge portions of each blank. The blanks next pass through the creasing heads which crease each blank in alignment with the previously formed slots. In such machines, it is therefore necessary that two independent sets of heads be'utilized to condition each blank for folding into a container.

To define the panels in a blank of corrugated paper or board that will make up into a corrugated container when set up, the blanks heretofore have been provided with both single and double creases. Single creases have not been desirable, because when the panels or sections of the blank are folded upon themselves to what is commonly referred to by the trade as a complete 12 Claims. (chm-so) one hundred eighty degree fold, too great a strain is exertedon the outside face or surface of the blank whichmay fracture the paper, except when using the best kraft-lined corrugated board.

Double creases are therefore generally utilized when a portion of the blank is to be folded to one hundred eighty degrees, such as when colpurposes.

When double creasing a blank with conventional equipment, as is now common in the art, no provision has heretofore been made to limit thefold at each crease to ninety degrees, and the result has often been lopsided and uneven folding of the blank, which frequently has been so bad where the creases are disposed substantially parallel to the corrugations, that the blankcould not be folded and taped by automatic machinery and obtain a uniform product which .would be acceptable to the trade.

One of the features of the present invention resides in the construction of such a machine wherein but a single pair of slotting and creasing heads are utilized, said heads being provided with combined slotting and creasing dies, whereby as each blank is fed between said heads, the required slots and creases are formed therein in a single operation and with the assurance that said slots and creases will be accurately disposed with respect to one another.

It is therefore the primary object of the present invention to provide notonly a novel combined cutting and creasing member or die, but to so shape the pair of cutting and creasing members that when the blank has been creased and is subsequently folded over upon itself along adjacent creases, each crease will limit the paper to be bent but ninety degrees, whereby adjacent creases will permit the blank to be folded to a complete one hundred eighty degrees bend or fold, the shapingof the creases by the creasing members being such that the opposed walls of each crease will contact each other and thus limit the corrugated board to a ninety degree bend at each crease, thereby resulting in accurate folding of the blank panels so that when the opposed ends of the blank are secured together by suitable means, such as a binding tape, the walls of the partially completed carton or box may be collapsed into parallel relation to facilitate storage, and with the assurance that the walls at the corners of the collapsed carton or box will not be subjected to excessive strain because of double folds.

A further object is to provide in a box making provide two closely spaced parallel creases disposed transversely of the corrugations and parallel with the direction of blank travel and whereing members and in the manner in which they are removably supported on the head; in the means for securing the slotting knives in the other of said heads and whereby one of said knives is circumferentially adjustable with respect to the other and without requiring its removal from the head; in the provision of a pair of opposed creasing members having their inwardly facing peripheral corners providing cutting edges, and the outwardly facing peripheral corners of said members being beveled at such an angle that the combined angles-of said beveled faces is less than ninety degrees, thereby to cause the inclined walls of each crease to firmly contact each otherwhen the blank is bent therealong, whereby the resultant corner of the box will be substantially right-angular in configuration, as

there will be no slack" or "looseness in the bend or fold; and in the simplified construction of the creasing members and cutting knives, whereby they may be readily removed for sharpening or repairs, if necessary, and also whereby one set of dies or knives may be quickly substituted for another, should it be deemed a'dvisable to change to narrower or wider dies and knives for a given job.

Other objects of the invention will appear from the following description and' the accompanying drawings and will be pointed out inthe, annexed claims.

In the accompanying drawings there has been disclosed a structure designed to carry out the various objects of the invention, but it is to be understood that the invention is not confined to the exact features shown, as various changes 'may be made within the scope of the claims which follow.

In the drawings: Figure 1 is a view showing a portion of a paper slotting machine with theinvention embodied therein;

Figure 2 is a large detail sectional view on th line 2-2 of Figure 1, showing a box blank being fed between the complemental cutting and creasing heads, one of the knives being shown cu ting a slot in the blank? Figure 3 is a view similar to Figure 2 showing only the creasing dies in action;

Figure 4 is an elevational view of the complemental cutting and'crea'singheads with one of the cutting knives in operative'engagement with the combined cutting and creasing members;

Figure 5 is a detail view substantially on line 5-5 of Figure 4;

Figure 6 is an enlarged fragmentary view showthe ing the effective combined angle of the beveled faces of the creasing members and also showing the cutting edges thereof:

Figure 7 is a view showing a blank completely slotted and creased;

Figure 8 is an enlarged detail sectional view showing a blank of corrugated paper being creased by two parallel cutting and creasing members to in it will be noted that the axial spacing of the creaiing members leaves a portion of the paper stock uncrushed between the adjacent creases formed thereby;

Figure 9 illustrates a blank bent along one of .the creases formed by the dies herein disclosed and showing the means for limiting the fold or bend to approximate y ninety degrees;

Figure 10 is a view showing a double bend wherein the connecting portion between the two parallel walls is disposed at right angles thereto;

v Figure 11 is a view similar to Figure 8 but showing the stock creased in parallel relation to the corrugations therein;

Figure 12 is a view similar to Figure 9. and

Figure 13 is a view similar to Figure 10, except that the paper stock has been creased in parallel relation to thecorrugations thereof.

In the selected embodiment of the invention herein disclosed, there is illustrated in Figure 1,

. for purposes of disclosure, a portion of a conventionaliblank slotting and'creasing machine comprising a table 2 having mounted thereon a suitable hopper or magazine 3 in which the box or carton blanks l or other articles to be slotted and creased are placed.

The blanks are fed from the magazine 3 between 9. pair of complementa'l cutting and creas heads are generally designated by the numerals: I

in heads by suitable means, not shown. These 6 and I, and are mounted upon shafts 8 and 8, respectively, which are simultaneously driven in opposite directions, as indicated by' the ,arrows, by suitable means not believed necessary to illustrate in the drawings. From the heads 8 and 'l the slotted and creased blanks are delivered onto a suitable chute or inclined plate II, as is well known.

An important feature of the present invention resides in the'provision of a blank slotting and creasing machine of a single pair of heads 6 and I which carry combined slotting .and creasing members adapted simultaneously to slot and crease each blank, as the blanks are successively fed therebetween from the magazine 3. i

The upper head -l,'as best shownin Figure 2, comprises a body I! having a hub portion l3 bored to receive the shaft 8, which is non-rotatably supported on the shaft by a suitable key M, indicated in Figure 1. The body l2 has a cylindrical portion ii providing a radial face It against which a pair'of segmental knives l1 and it are secured by a suitable clamping ring or nut is which is received in threaded engagement with the hub ll of the body l2, and may be provided with socketslor recesses It for receiving a spanner wrench. whereby it may be readily manipulated to secure theknives l1 and 18 in position in .the head 8, or release them therefrom. The knife i1 is preferably non-adjustably secured in the head, and is shown retained in fixed position I aieaoao v The lower head 1 comprises a part which will hereinafter be referred to as the die hold622,

- is an important feature, as it makes it, possible f to quickly change the position of the knife, II

The die holder has a hub 24 mounted on the shaft 9 and restrained against rotation thereon by a suitable key 25. A pair of annular creasing and cutting members 26 and 21 ,are mounted on the hub 24 of the die holder 23 and are spaced apart a predetermined distance by a suitable spacer 22,

whose width determines the space between'cutting faces of the knives -l1 and I4 and therefore the width of the slot in the blank. In other words, by spacing 'apart'the combined creasing and cutting members 26 and 21, as shown in Figure 3,

an annular peripheral groove 29 is provided.

holder and clamping ring or nut 3|, respectively,

serve as die faces and co-act with the corresponding surfaces I5 and 22 of the head 8 to engage as blank feeding members and support the blank as it passes between the heads 6 and I, as will be clearly understood by reference to Figures 2 and 3.

- In the operation of the machine, the knives l1 and 18 of the upper head 6 are preferably mounted in diametrically opposed-relation, as shown in Figures 1 and 5, and are so spaced with relation to the width of the blank in the direction 1 of blank travel, that as each blank is fed between with respect to the knife 11 without requiring its removal from the head, and with the assurance that the cutting edge or periphery of the knife II will always be accurately disposed with relation 7 to the axis of. the head 4.

Another important feature of the invention re sides in the shape of the peripheral edges of the opposed cutting and creasing members and 21. In'the ,manufacture of paper boxes, it is highly desirable that the walls of the finished box are disposed in right-angular relation to one another.

Heretofore, some dimculty has been experienced to produce boxes wherein the walls of each box were disposed in right-angular relation to one another, primarily because the conventional method of double line creasing usually allows a slight slackness or looseness at the creases where the blank is folded, which may result in the outside edges of the blank, when folded, not being parallel one'with the other resulting in some of the boxes of a given run being rejected for use because of not being uniform in configuration.

In a conventional form of blank,such as shown in Figure 7, three sets of combined creasing and.

scoring heads are utilized, as each pair of slots, and'their respective creases, require one complete set of such heads. The heads are axially adjustable on the shafts 8 and '9, whereby the spacing between the slots ina direction lengthwise of the 'blank may be varied to suit any size blank. The diameters of the two heads are such that for each revolution thereof a blank passes therebetween and is slotted on its leading and trailing edges, as shown in Figure '1. The circumferential adjustment of the knife l8 makes it possible to quickly adjust the spacing of the knives to suit the height of the blank, as hereinbefore stated.

Each blank is also provided with transversely extending creases 30, which intersect the inner ends of the slots cut in the blanks, as shown in Figure '7, and which define the height of the box when set up for use. The creases 30 are usually formed in a separate operation in a different type of machine either before or after the blanks are slotted and creased parallel to direction of travel through the slotting machine.

To facilitate adjusting the knife l8, it is shown provided with a laterally or axially disposed ledge or flange 38 which is received in an annular groove 39 provided in the portion l2 of the head 6. The ledge or flange 38 prevents the knife 18 from becoming detached from the head 8, when the clamping ring 16 is partially unscrewed to free the knife 18, whereby it may becircumferentially To overcome this diiflculty I have discovered that by beveling'the outwardly facing peripheral corners of the cutting and creasing members 28 and 21, as shown at 4| and 42, respectively, in Figure 6, whereby the combined angle A of said inclined .or beveled faces may be less than ninety degrees, that such slackness or looseness at each crease may, be entirely eliminatedfwlth the assurance that each fold in the blank will be in the form of a,true right angle, as shown in Figures 9 and 12, and in the case of double folds, as shown in Figures 10 and 13, the blank walls will be symetrically folded. Thus, when the blank is so creased, all boxes will be substantially uniform in appearance, when set up.

By thus making the combined angle A of the opposed beveled faces 4| and 42 of the cutting and creasing members 28 and 21 somewhat less than ninety degrees, when the panelof a blank is folded to provide a wall of a box, the inclined wall portions 43 and 44 of each crease, being disposed at less than ninety-degrees with respect to one another, will firmly contact each other, as shown at 45 in Figures 9 and 10, thereby causing the walls to be put under a slight tension as they are bent into right-angular relation. The result is that when all of the panels in a blank have been right angular relationt'o one another and, in addition, the corners of the box, when the latter is set up, will be relatively non-yieldable as compared to boxes made in accordance with the usual conventional form of creasing. The inwardly facing peripheral corners 46 of the combined cutting and creasing members '26 and 21 have a shear edge surfaceand provide the cutting edges which co-act with the segmental knives I1 and Is to slotthe paper, as hereinbefore stated.

In double folds such as shown in Figures 10 and 13, the inclined walls 43 and 44 of each crease will firmly contact one another, whereby the outside connecting wall portion 41, shown in Figures 10 and 13, will be under tension and will be disposed at right angles to the parallelwall portions 48 and 49, and the folds or bends between the wall portions 41, 48 and 48 will be such that the paper is under a slight tension at the corners of each bend, thereby causing all bends or folds to be substantially right-angular in cross-section,

7 Each combined cutting and creasing member It and 21 is preferablymade in two halves, as indicated at II in Figures 4 and 5, in order that-they may be quickly removed for t The parts or halves of each such member are retained against relative outward and rotary movements upon the member 23 by suitable dowel pins 52,

ansaoso thereto.

the clamping ring or nut Ii serving to securely The segmental knife sections l1 and il may be similarly removed from their supporting head I claim as inventionzf 1. In a machine of the class describedfa pair of complemental cutting and creasing heads, one

of said heads comprising a member providing a cutting edge and an annular creasing surface,

and means. carried by the other of'said heads including a knife and a creasing surface both cooperating with said cutting and creasing mem-' berto "simultaneously slit and crease material by partially unscrewing the clampini'ring or nut l6 sufliciently to permit the lateral flange or ledge 3| of the knife I! to be withdrawn radially from. its supporting recess, as will be understood by reference to Figure 2. The knife l1 may readily "be removed, when the clamping nut I! isloose, by

withdrawing the dowel 2i.

In Figures 2 and 8 I have shown the spacer a for spacing apart thefrnembers 28 and 21 as being likewise formed-in two pieces for quick removal so that other size-spacers may be quickly replaced. If desired, the spacer may be made of spacingbetween the members 26 and 21 may readily be varied by inserting additional laminations or removing laminations therefrom. The important thing, however, is that the spacing between the. combined cutting and creasing members 26 and 21 must corresponding substantially to the width or thickness of knife sections l1 and i8, whereby the cutting edges of each knife may co-act with the cutting edges It of the members 26 and 21 to'slot the blank, as shown in Figures 1 and 2.

The knife sections l1 and is are each provided at one end with a transversely disposed chisel-like cutting edge 53 and 54, respectively, adapted to cut the material at the inner ends I of the slots 56, as will be best understood by reference to Figure 7. A clean-out finger 51 ismounted on the' machine and has its upper end received in the groove 29 between the members 28 and 21 for well known in the art.

In Figure 7 I have shown a corrugated container box blank comprising three sets of slots and creases which are necessary in the formation of conventional square or rectangular corrugated fed between said heads. 2. In a machine of the class described, a pair. of complemental cutting and creasing heads, one

of saidheads ccmprisinga pair.of combined cutting and creasing'members each having a.

cutting edge and 'ablank supporting surface. and means carried'by. the other of said heads including a segmental knife and a supporting surface, both adapted to cooperate with/said cutting and creasing members to simultaneously slit and crease material fed between said heads.

3'. In a machine of the class described, a pair of complements] cutting and creasing heads, one of said heads comprising a pair of annular members spaced apart in anaxial direction and providing spaced cutting edges and supporting surfaces, and meanscarried by the other of said two or more sections or laminations, whereby the cleaning the waste stock out of the groove, as is I containers or boxes provided with end flaps for closing the box'ends which are usually glued down. It is to be understood, however, that the number of such sets of slots and creases and the spacing therebetween may be varied to suit any blank regardless of the particular use to be made of the blank and without departing from the scope of the invention.

I It will be apparent to those skilled in the artthat I have accomplished at least the principal objects of my invention, and it will also be ap-- parent to those skilled in the art that the embodiments herein described may be variously changed and modified without departing from the spirit of the invention, and that the invention is capable of uses and has advantages not herein specifically described; hence it will be appreciated that the herein embodiments are'iilusheads and receivable between said members and coacting with the cutting and supporting surfaces thereof to simultaneously slot and crease material fed between said heads,

4. In a machine of the class described, a

of oomplemental cutting and creasing heads, one of said heads comprising a pair of combinedlcutting and creasing members spaced apart in' an axial direction and each provided with a cutting edge, and means carriedby the other of said heads, including a knife and surfaces, both adaptedto coast with said cutting and creasing members to simultaneously slot and crease blank fed between said heads.

'5. In a machine of the class described, a pair of complemental cutting and creasing heads, one of said heads comprising a pair of combined cut-- ting and creasing members spacedapart in an axial direction to provide a peripheral groove,

said members providing spaced cutting edges and supporting surfaces, and knife sections carried by the other of said heads and receivable in said "groove and coacting with said cutting edges and supporting surfaces to slot the opposed marginal edge portionsof blanks fed betwe'en said heads,

simultaneously asthe blanks are creased by-said heads.

6. In a machine of the class described, a pair of oomplemental cutting and creasing heads, means for feeding blanks therebetween, one of said heads comprising a pair of combined cutting and creasing members spaced apart in an axial direction to provide a peripheral groove, and knife sections carried by the other of said heads adapted to enter said peripheral groove and coacting with said cutting edges to slot'the opposed marginal edge portions of each blank fed between said heads, said other member having surfaces to coact 1 with said cutting and creasing members for sithereof and substantially in alignment with said mulaneously creasing each blank transversely slots. J

a '1. In amachine ofthe class described, a pair I of complemental cutting and creasing heads, means for feeding blanks therebetween, one of said heads comprising a pair of adjustable combined cutting and creasing members spaced apart f 8 trated only, and that my invention is not limited 9 in an axial direction to provide a peripheral groove, and knife sections carried by the other of said heads adapted to enter said peripheral groove and co'-acting with said cutting edges to slot the opposed marginal edge portions of blanks. fed between said heads, said other member having surfaces to coact with said cutting and creasing members for simultaneously creasing each blank adjacent to each side of each slot and across the comprising a pair of combined cutting and creasing members spaced apart in an axial direction to provide a peripheral groove, the inwardly facing corners of said members providing cutting edges, segmental knife sections carried by the other of said heads and spaced apart circumferentially thereon, said knife sections being adapted to enter said groove and coacting with said cutting edges to slot the opposed marginal edges of each blank fed between said heads and whereby the slots are longitudinally aligned in the direction of blank travel, said other member having surfaces to coact with said cutting and creasing members for simultaneously creasing the blank adjacent to the sides of said slots and across the full width of the blank.

9. In a machine of the class described, a pair of complemental cutting and creasing heads,

means for feeding carton blanks therebetween, one of said heads comprising a pair of combined cutting and creasing members spaced apart in an axial direction, the inwardly facing peripheral corners of said members providing cutting edges and the outwardly facing edges thereof being beveled to provide inclined creased faces, and means carried by the other of said heads receivable between said members and coacting with the cutting edges and inclined creasing faces thereof to simultaneously slot and crease each blank fed between said heads.

10. In a machine of the class described, a pair of complemental cutting and creasing heads, means for feeding carton blanks therebetween, one of said heads comprising a pair of combined cutting and creasing members spaced apart in an axial direction, the inwardly facing peripheral corners of said members providing cutting edges and the outwardly facing edges thereof being beveled to provide inclined creasing faces, and means carried by the other of said heads and 10 coacting with said cutting edges and inclined creasing faces to simultaneously slot and crease each blank fed between said heads the angles, of said inclined creasing faces being of such inclination that when the carton blank is folded along one of the creases produced by said members, the opposed walls of the crease mark will contact each other to in the blank.

11. In a machine of the class described, a pair of complemental cutting and creasing heads,

means for feeding ca rton blanks therebetween,

one of said heads comprising a pair of combined cutting and creasingmembers spaced apart in an axial direction, the inwardly facing peripheral corners of said members providing cutting edges and the'outwardly facing edgesthereof being beveled to provide inclined creasing faces, and means carried by the other of said heads and coacting with said cutting edges and inclined creasing faces to simultaneously slot and crease each blank fed between said heads, the combined angles of said inclined creasing faces being less than ninety degrees, whereby when the carton blank is folded along one of the creases produced by said members, the opposed walls of the crease mark will contact each other to provide a right 1 angle bend in the blank.

head having means to provide circumferential adjustment of one of said knife sections with respect to the other without'removal from the head, and said knife sections coacting with'said members to simultaneously slot each blank fed between said heads as the blanks are creased thereby. EDWIN G. S'I'AUDE.

REFERENCES CITED The following references are of' record in the 1 file of this patent:

UNITED STATES PATENTS Number Name Date 682,651 Tripp et al Sept. 1'1, 1901 2,311,698 Saubestre Feb. 23,1943

provide a right angle bend Page; No. 2,485,020

- of Correetion "EDWIN 6.. STAUDE I 1 It is hereby cel 't ifi ed that error; appear in the pepi ficat-ion ef the ahev'e 1- humbered petentireqmying correction-as fol lows:

- and that the said Letters Patent should be read withthese coneetions therein that r 'Co1umn 7, line 12, for the word member 'r'ead membere; oolun m 8, lines 67 and r simulenee'usly read simultaneously; column 9, line 38, I01 formed? read I I i v I the same may conformjo the record of the ease in the Patent Oflice.

Signed and 28th day of Fem"!- M D. 1960.

THOMAS F. MURPHY,

4mm: 0mm of Pam.

-. October 18, am 

